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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3778b1e0cb52051e6aca9feba72bf8dc6c45531517e0b24b8a50caf3ffb086' 
  AND token = 'TQhExex0fcr/ojXsbSr0qWhsg7es2LQj7E2d9qghpYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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