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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb912923d6c918c9364216af5110a41f6baebc05b200ed212f33140bba87a39' 
  AND token = 'vElxFiG4hDZxphbTUuYuEZ0mlkGhHt8os+a5F4QeHEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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