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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd3bb2faf06603a5157577abe4fc99a0ba63432b4b6e446dd5a66d2d172d768' 
  AND token = '0rnL4FCr1eNR80/nwvNTt5+//qK6GDA7Mj1DlOtbeNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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