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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6d9a33210bd95502f71be1a7a5b1748d12d12ea4308215a3c524840564a734' 
  AND token = '40TKvBwcmpGYbiWBgomiKM377t2ZMWBh4g6S8PIufC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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