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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03fb8a8d89c16c3d70c936fd875d96acdf4b0397247669cb13ae2a87ddfdf82' 
  AND token = 'm/1us88WTDN9Z/SWoHNQXst2JgGrJd6jcWXYVi5uKXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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