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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8204e71cae2d08965a3ec1c53fb9a8434542286f360c1d2ada3bf65b6ec1b541' 
  AND token = 'a0yKokGFf4y8rHP1HbpGJMrOosNzSlWsev47PK6GmEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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