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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ebb2b1073580bd56c347d737b5f6d5fe201861361356b017d0a2a67709e31d' 
  AND token = '7K7vl85bbZNQRNTvGHn+JzNpSGRashgHrCejTlXyEoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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