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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b857c349977e5fb6683467d6dad969dc488c8c9511376b1a61d64c34287e2f' 
  AND token = 'B4urpR4HfmF7G0onsMAKhxGpPllUhdtyF08oiiUMEEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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