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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5662fc5f8506e5daafeed09ce754b608f9e5d5ad6300eb7fe054254f06e8e40' 
  AND token = 'f5u0D+p06t35SZZgVNDJGxiWwOt1KkSawbX7phnIwog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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