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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9916401886c533a0141549a92b67d094e50e544c9ab434ac445be56b638de5' 
  AND token = '57EHNgueqQk30LFPu8Nrxqw3ICeQa2Io7zzl93tikpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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