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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55286c1e74ef6eb081a16d260f7dafbd294fbbb08051f94e6dfbf9b520ad8c31' 
  AND token = 'pCh3bmkluONFKfSgy49CDxML6/8xOHIW8Laag7ZdQfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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