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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9dab6279a6d9567ef95da307a20da1479f8275c76fa70be30cc734e24a380e2' 
  AND token = 'SM7RPBa2odP9fTmf6uGCVsIk9pG68iad+cLIU0XmF9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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