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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867697bc9b6e40b65143c117d4cfe69758d4e6d074a75f395c2f933ad98ca465' 
  AND token = 'fHxVfdr07I9/9QrtykAn5MN/bh9bXUse/7xV0U9mjSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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