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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf36b23511dd1b9277a71539fccc2da91b8bc75437b4d35503fa10c571db8a9a' 
  AND token = 'wTxwTvjaNuupYDrZwb7mU2MI0ktIycEA5KuOuzs3f0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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