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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a959e17ff45292c35e77f7752dc06041b4e1b280e3d77be9a3835e7487ebcedc' 
  AND token = 'UTj7syNDYLJKJdqm0z4M+XIGoo9QGNOd0ZNiBC7eFP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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