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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '145d406d74d88029388f403fa71ea400067b9f13f8f6a36d3c5ccc8f6b679652' 
  AND token = '9t7Z0vgHu4Fd1oIH822pgv8tMPc1OweOoTmjR7lYXEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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