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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735d99048e1d2509e8f349036896d5fa080eab5c43b18154003e2fdf63889e7e' 
  AND token = 'Lrm4cHtI/tbPsCwtrHZcr90uRVj3Gpzf0iY+7dno4Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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