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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4df2003ba0584849c62f735465ba1685cd4e7aff8936c0154816e8ae7f4bd61' 
  AND token = 'ujGTRpQud9hKcxxQEkfmXMQfAt3S1lmZ65iffsoXNBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}