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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9df609db9e4cf7819e477454edb6bb870b0458110afe6b0c57bc972c602b31' 
  AND token = '8KNkxwDC6fXI8vjl14Z6mRm4UFcccsQlm70Ckfv4UhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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