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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25de6e8c40d2cd0a2ff3314fb31f8f4fbc0324b55cb7ed3fcab38f2344016ec9' 
  AND token = 'oNj7GCf183tCON2UnlYLrSw7FocrIFBuJx1ZVXiBW7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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