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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c16d6b498682bfed1275eda3e5b831e2d71f5b99a7c0d989c20f4a373b33bdd' 
  AND token = 'P7RM74GkDkj+3ASrnGXE/noGR8mY4+O4Z8abwAa/YlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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