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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23bb097443f8d5b408e22bf4e7508ccc89766715e5efb56c3d247daede53619' 
  AND token = 'r3useKmwD5HqAO/8aSmd2ogKtJmtoQ2hYqQfIlqhYYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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