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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737cb25aab9b73f2b28110b7381ee3bcb7027dfd942d9872e8a7e7e70ef57037' 
  AND token = 'JPzCwzKg8dU+abbOgJ4plm2Q3gaVxvB/6iVRCiBt31Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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