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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39dc3414448981a092b2e912c5804fe181f95cac051c3a51929f6990eb67ab97' 
  AND token = 'EWktSM/qXJ5v5TOiqLcMfIiNF9y+Sbsb5JolQA4Eawc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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