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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7240ee4202ca143ce0d6a30adf0770a46f5ab827cb90e4485896afadd233de3c' 
  AND token = '/U7FwqGiOS2vQqCqG9i/B+lS4esmOk5j8854yISsuLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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