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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71ac9a2d661bcd12c4b56f687e69eb69f3d908a32c0b9546a2fa88845e7b7d3' 
  AND token = 'RzOrjj5wUShpPl7UN3jrlaxhxop9iOCROzyYjgZOvOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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