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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e186bae7c8215f7ce136cac27f47237ec9caad0c51e436071089cd4f46625f16' 
  AND token = 'wDKB/hiRBYdm7aXCHy8tiDyT4qA06tiOx9C7e48ApGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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