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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1f24aebd063de5760ae18520b1f52898b01bbde7061736e95a79827e4e83e8' 
  AND token = 'FRylZwf3YxMJqLnke7dZ0yxi7L4mNRgUPsH1d/jTYPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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