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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7e7d78c3af7d265867da5a63575e5d493cb064c475d9ac6e0077af175fe9b9' 
  AND token = 'sgtU8udLZt3fVIaBCTU9m31FBt2FhXCVg1xB5Q7jdmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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