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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393990e7e941298afa14fcedfe6f0f3c8ee595884accf9043a6f7c5e5cb3a336' 
  AND token = 'EtKcdzGZAJ8nptfUfzuKFgefTnYI81IvX31BlmU54u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.02823

JSON explain

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