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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5237ef19ba54eb273b2c5684279cd3b65af6b90417744bfa66a74134b547ca2' 
  AND token = 'Sr1SOqi+Wy17SLm4K2CM0R79ETmVcFv0YX5tZZ/Lh6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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