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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01613dbb5c3cdba403b996c8d158b8c204f7ecc08c5ba7b6a2ce6cb78d0149c' 
  AND token = 'C/Liy4ygfLEk4e43taOqU9pryOeYeeo8rkNSCFIj3A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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