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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54d240248240f76af97641b3e1b87c12b78f0f399575a467519f156f3b8ca156' 
  AND token = 'xpM1OdfPlQ1QoTzaLHYq5trv12CgJ5evuy6YLPPfMao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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