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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79781db07bf928d504ee614641e008f73765f29f018a0e02732d77faee53531c' 
  AND token = 'cCq6FEoV2ttr3AXdGq9gmhtPtFAPb7hOxIgwszBpLzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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