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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbcab75c6841104e0ae14cecd2ed1b47c860754195a52754687534316dbf6d3' 
  AND token = 'GHRgdELHl1uGj7XEqFabtAdHbOsbQPz3cpRZg+zm6ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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