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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e008d07db8d505c70adfd532948542f679bf7416c5764c3b619da5a76189d870' 
  AND token = 'P+oIOP2DlhqsGSOSFGDwyNrAzDWIp/Q1J73GxNswyis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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