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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56e28291038e66ab8120ae20d5c02ae63bfd1de4f29fe3b0a6b1c434d3e8ced' 
  AND token = 'PvU6ORNhfsUVvst1JUm28Q6j568GvlrQN4hjJ2jxyX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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