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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90880cad9b1b60c34f1c972cd6139783117b6bf18c147f178776a7f052920754' 
  AND token = 'Qv7/ozdT+yo+iiipFhf9RngPhuEbXWmOXI9abubhym0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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