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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3474c458e1ba08096f1447c77f011e9f1e419c4ead203415e52b316ca4b3d27b' 
  AND token = 'BmZWu4rj+5IR0Wz7vxHCbKppBeXdLH1g0XidYv8OdNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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