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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dfd0d0fdc8e8168c4264dffd1aa91254e406f5c12bebe51319dce1959b2e4bc' 
  AND token = 'ZlIn+nVPfHYyfam71YuXzblf09dDn87Wj8abp3n8WY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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