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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79a34a5f2bf7ec751a1e481462dccfbd6fda6a1c494a9aeeb338d8c935f4637' 
  AND token = 'oFyjjRwJouNXADVzTSCS5bqJpvXMucPt5KmLAbykybM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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