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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67246a6e9a85319cce6442ee8a46cb99adc760c554eb9d74b66f85cd05590888' 
  AND token = '4XPWc8WOVwD9g/IGMRa2vN08QHewNDyajOfWl2Jp6eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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