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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ed9ff49bb3e13434d4a4c58d57a5d926a85912d083440d9b2ad94721e0ce1a' 
  AND token = 'mBXVYwPQA80q6MhtbMylcqQdkXF1BYWZkG5/YyYCHI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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