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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd9b08806204ae761825a152a5da675e37a55854676324986eb57cc0b572642' 
  AND token = 'FNVSe24OFl+6Su+9iOdt8XeCsFR2F5GdYFoZacOudCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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