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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff82a0d38d97d99459b9ce0c43b33e917512f2e2e09792eac106ab08e8ee1cf1' 
  AND token = 'q3MeC9qtqoYHf8NY84S1KiOu8jF7grPix+5d75Ft8TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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