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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6c79f74357c009d3090c4f1411b1ffe6ca8770207169690a47221600a24952' 
  AND token = 'kiQ4JgdhQjQa7RELpNmrKytbPmmWf/+GX46yj6S7izI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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