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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa8a990b29d32d70df495ab694fa2538d4834f7831793a764791b7068ebcea2' 
  AND token = 'M8ihicRLnUaxEc0ala0u6YeBDxrErwiCNlbBspnC2SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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