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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3111d36e62d7f90c1023f13b401eed06859532554a1ba817c7733937fc64d1' 
  AND token = 'ycBhX3GNmhTSIu5ZDfyzDKDQYAMLisjZX5PefbXIjlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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