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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d85488c2406c4ee081ad2ec21a5e1f0be5a9d1afbb6f7e5759835c1aef9526' 
  AND token = 'SpXnay+PW2jGQcmJoyLOT8Tl3HCMYezA/6YlMorCgX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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