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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59dffe4edc2f3ffbc2d34445a4fcbe11eae5be9390b4c2dcc646187b0ab7355' 
  AND token = 'v1OghLZen3frXBB6nfrMo3tPrMNySFP1wRT2d6vkFxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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