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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175ba6e951a784f9d36ecae9c82c3cfef03903c650022c52ab79a57d12048adf' 
  AND token = 'JvRXCVv92bzy1Xblv1u0o86V0VgM8LWjukr27/6WFCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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