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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a3806cef50e0589ca93914cb82d0d38a6d559bb371f7de1cb9837f1ffe4279' 
  AND token = 'nZAO4Qo2FKjLn8jtzbjDjy+vJjcgFMQRNQgCqkN32NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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