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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5912d17912119989152d45c18c77948d77e2cfb4b690e366c14ca13d44a6ba' 
  AND token = 'xMokPseKz+5CI8r7f5ssLi+AkI9tLtLbOj3lUPVNjfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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