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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1e26ef4a292b3df92a91ad986fdc369ef95b0a169af57d43f001a62c8669c0' 
  AND token = 'u1y9W4CQ5uhKIZmFPfHjWU/fECU99O4vjl1bXIUYutE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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