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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00c25e5e0e3c6f6b235bb9c44b6c10750c7d7889342269ff0ff0ce1354657ac' 
  AND token = 'rrTaKCtGpwbjlQvztkqRNDlhjsQISwkRtLh5FnWtrOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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