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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0056f7586565d9589b87392d3dabea8407b8dc567dedfb84abccb8f131378a7' 
  AND token = 'mwcBcHvHeIzzidd+bEYqfNhs75SmRDGr/ihxcDx2RPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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