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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80cee738ff2f9585775a45b8fc2ab5063f5fe58f83bd42daeaac27e7ec65682e' 
  AND token = 'KOtSTudM3J/tZ2oKmiCtOoTF6J4HEznuzSIimDNOByk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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