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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fef184386938fadd124ad99dcd7ccbcbef142d67e7e75490404bfda28d9db30' 
  AND token = 'U3OpCLmVE7+vV6cXT8+QKwBAxtxd1ZI9NMQ5hO1ZfLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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