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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60d121f0d42a608931ce7dc429c9332378d96bed22bd7f01b99c1c25185ce4f' 
  AND token = 'H8uixyDW75oCvoCcU538TBcdNBRRb/4qHWaZRxf1B5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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