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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d6f48c3bc61a1ae5b643702b4c7854448866e60696621fc41c1e259d7c5194' 
  AND token = '+FIpNV0/KbVWSaDveC9wl+BArPVZNqV3nSBbEVNalR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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