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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b002280e7cc1dccc72229e8e6d2c0e237266e0dccbfc336f7f2629ba7e89f9ee' 
  AND token = 'evqs+8zJ8HD44NUJxagWkx95nLvW6EGWA6BSj5tok74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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