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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27318d027c7cb67e9c4e10a3e4ec90b1699c699ae4faa884a97b03486c96479a' 
  AND token = 'vi+ZcMIlXsqy2xR7ov4vw0ZX5Zp89kqlCWAwG5MotQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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