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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9935b5fac10036fdfa105210e2eb73d4f858f627f09b2ae62fd0801b38033232' 
  AND token = '9A2N7p2OLE/IGAziOhIwDQy7zcFaxAkk1gBrGOxvZ7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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