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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ba092ee42ab64e71cd238f1e36a7e3b6e2fab55edeb24ef7449386adb9f492' 
  AND token = 'V9Up/oQZ+b6xn1yUZ0g+JQPgrVbroMyWqIqjWnGH8Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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