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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79611ebbded81c9527a3144dc7c57c7a8c27e6ee1c42c4ef848e44dfec462f2d' 
  AND token = '6XDzBXL5I9QqNqV9X80tMbNmCNf75SBxmDgVZk143sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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