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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c205889897647406466981042b94301476e7c450fcc28ff1adcebacf2b963e' 
  AND token = '4mgPP/mYz1PXn4HmHWeQxs9gtMHlYRLPT0yx7IUphfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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