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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd670de851bde3042201c23b83919dd87a47e5e1b005b6192eb8544d8a7c0bee4' 
  AND token = 'JBN9NcvH8Kzz7Wiys7aYrq1zxkT/V49qT1w799FrjbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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