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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48ce05d2bb2c953aecf6a2730172a273b4ecc081a3fa561fb40ad9805df199cf' 
  AND token = 'Jo2c976mN47sqA5F++EfQhnf+gqFn81WrcD0DDPtFv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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